Record-disk.



- 'A. ETTLIN GE RECORD DISK.

APPLICATION FILED FEB; 28' I913.

' 1 Patented Au 17, 1915.

INVENTOR film/mm fizlz'ryer ABRAHAM ETTLINGER, 0F'NEW YORK, N. Y.

RECORD-DISK msoeao,

Application filed February as, 1313. Serial No. 751,274.

New York, have invented a new and I'mproved Record-Disk, of which thefollowing is a full, clear, and exact description.

The invention relates to v graphophones and similar machines, and itsobject is to provide a new and improved record disk provided with meansforquickly and accurately cen-, teringthe dpaquerecord disk on thecentermg pin of the revolving platform of the graphophone. In ordertoaccomplish the desired result I use is made of a plurality of groovesformed in the central portion of the record disk and leading to theusual central opening adapted to engage the centering pin of therevolving platform of the graphophone.

- A practical embodiment of the invention is represented in theaccompanying drawings'forming a part of this specification, in

which similar characters of reference indicate corresponding parts inall the views.

' Figure-1 is a perspective view of a record disk shown in conjunctionwith a graphophone of ordinary construction; Fig. 2 is an enlargedsectional side elevation of the record disk showing the manner in whichthe disk is placed in position on the center- I ing pin of thegraphophone; Fig. 3 is a reous surfacein accordance with the soundsduced face view of a record disk of modified form; Fig. 4 is an enlargedsectional side elevation of the same on the line 44 of Fig. 3, andapplied to the centering pin of the revolving Platform; and Figs. 5 and6 are face views of other modified forms of the record disk.

struction is provided with the usualrevolving platform B having acentering pin C adapted to, be engagedby a centralopening' D formed inthe record disk D to besupported on the revolving platform B and carriedaround by the same during the time the stylus of the graphophone is inenga ement wlth a spiral grooveE' fprmed in t e face of the record diskD and possessing asinudesired to be reproduced. The record disk D isprovidedwith the usual central ortion D provided with the-usual legendsindicating the makers name, the title and other matter, and; thiscentral portion D is prof5pecificat1on of Letters Patent.

Patented Aug. 17, 1915.

vided with a plurality of guide grooves D leading to the .centralopening D. The guide grooves D may be. of various shapes, as indicatedin the drawings, but in the main the grooves D gradually decrease inwidth on approaching the central opening D, and the. groovespreferably'increase in depth on approaching the central opening D, asplainly indicated: in Fig; '2.- The grooves are preferably radiallydisposed and are equally spaced apart, thus practically. ornamenting thecentral portion of the record disk.

In the modified form shown in Figs. 3-. Sand 4, the sides of the groovesD are de- .fined byradial arms D arranged in the form of a star-likefigure, the surfaces of the arms D being flush with the face of therecord disk. H i In using the record disk the operator en gages thecentral portion of the record diskwith the centering pin C'a-nd a slightmovement given to the disk by the operator readily engages one of thegrooves with the centering pin G, and then the operator on moving thedisk with the centering pm in con: tact with the groove finally guidesthedlsk into central position relative to the centering pin 0 so thatthe opening D engages the centering pin 0. 1 a It is understood that fordouble record disks the grooves, are'on both faces of the disk, whilefor single record disks it is only necessary to provide grooves at theunder face of the disk. Although I have shown several forms of rooves inthe drawings, it is evident that do not limit myself to the particularshape shown, as the same maybe varied without I v e deviating from myinvention.- A graphophone A of any approved con- 1 Having thus describedmy invention, I

claim as new and desire to secure by Letters Patent;

1. As an article of manufacture, a sound reproducing record disk.provlde'd wlth a central opening and with. guide grooves.

leading to and grouped around the said 'cen-.

tralopening, the said grooves gradually diminishing in width as theyapproach the. central opening.

. e r 3. As an article of manufacturqa'sound reproducing record diskprovided with a central opening and with guide grooves leading to andgrouped around the said central opening, the said grooves graduallyincreasing in depth as they approach the central opening.

4. As an article ofmanufacture, a sound reproducing record disk providedwith a central opening and with guide grooves disosed radially andgrouped around and eading to the said central opening.

5. As an article of manufacture, a sound reproducing record diskprovided with a central opening and with guide grooves at the centralportion of the disk and leading to and grouped around the said centralopening.

6. As an article of manufacture, a sound reproducing disk provided witha central opening and with a plurality of radial guide grooves havingrelatively narrow,

ner ends, which lead to and are grouped deep inaround the centralopening, atively shallow outer ends surface of the disk, the sides andbottoms of the grooves being gradually taperedbetween their said ends,all for the purpose described.

7 As an article of manufacture; a sound reproducing disk provided with acentral and having rel- V merging into the and depth from one

